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    <title>Document</title>
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    <!-- autoplay想要生效需要配合muted属性 mp4最常用的格式-->
    <video src="./dd.mp4"></video>
    <!-- 这样子单纯不确定的视频，浏览器会禁用自动播放，需要手动点击播放 -->
     
    <video src="./dd.mp4" loop></video>

    <video src="./dd.mp4" loop muted></video>

    <video src="./dd.mp4" loop muted autoplay></video>

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